package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author 杜佳辉
 * @version 1.0
 * @date 2024-11-20-13:18
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {


    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    public static final ThreadLocal<UserDTO> threadLocal = new ThreadLocal<>();
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取token  2.以token为key获取redis中的用户
        String token = request.getHeader("authorization");
        if (StrUtil.isBlankIfStr(token)) {
            return true;
        }
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(RedisConstants.LOGIN_USER_KEY + token);
        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            //4.不存在，拦截
            response.setStatus(401);
            return false;
        }
        //5.将查询到的hash数据转为UserDTO对象
        UserDTO user = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //6.存在，保存用户到ThreadLocal
        UserHolder.saveUser(user);
        //7.刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.放行
        return true;
    }
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
